PEG-20

PEG-20 is a polyethylene glycol — a synthetic polymer created from ethylene oxide and water. It belongs to a family of ingredients widely used in cosmetics, pharmaceuticals and industrial products. In skincare formulations, PEG-20 typically functions as a humectant and solvent, helping to draw water into the skin and improve the texture and stability of products.You'll find PEG-20 in a relatively small proportion of skincare products (roughly 0.1%). It's particularly valued in formulations where consistent blending and hydration are priorities, though it remains less common than some other …

PEG-20 is hydrophilic, meaning it has a strong affinity for water. When applied to skin, it works as a humectant — drawing moisture from the environment and deeper skin layers to the surface, which can help skin feel more hydrated and supple. In the formulation itself, it acts as a solvent, helping to dissolve and blend ingredients that might otherwise separate.

PEG-20 is a background ingredient — you won't need to do anything special to use it. Simply apply formulations containing it as directed. If you're using a product with PEG-20 as part of your routine, treat it like any other humectant-rich product: pair it with an occlusive step (moisturiser or oil) in drier conditions to lock in hydration, as humectants work best when skin's barrier is sealed.

PEG-20 is generally considered safe for cosmetic use. Allergy to polyethylene glycols is rare, though individuals with known PEG sensitivity should avoid products containing it.